Working Mother Media divided groups into Baby Boomers, Generation X and Millennials, who were born after 1981.

Younger moms and dads were more likely to be happy with their relationships, how they split home chores and with what their partner earns.

Younger moms were also the most likely to suggest that one parent stay at home with the children, with 60 percent of Millennials saying such a situation was ideal, compared to 50 percent of Generation X and 55 percent of Baby Boomers.

Hillary Clinton's office said "nothing nefarious was at play" when the former secretary of state used her personal email address, rather than one provided by the State Department, during her four years as America's top diplomat.